S-90343A133 1/4"-20 x 7/8" ASME B18.3 18-8 Stainless Steel Thread-Locking Socket Head Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance through integrated epoxy thread locker that eliminates loosening in high-stress environments
• Superior corrosion protection with 18-8 stainless steel construction, ideal for harsh industrial conditions
• Exceptional mechanical strength delivering 70,000 psi tensile strength for heavy-duty applications
• Precise thread engagement with Class 3A fit ensuring reliable, consistent fastening performance
• Wide temperature tolerance from -60° to 300°F for stable performance across diverse operating environments
• Optimized drive efficiency with 3/16" hex socket design providing secure tool engagement and reduced stripping risk
• Industry-standard compliance meeting ASME B18.3 specifications for guaranteed interoperability

Professional Applications & Engineering Value

This 18-8 stainless steel socket head cap screw with permanent epoxy thread locker addresses critical vibration-induced failure points in industrial machinery, automotive assemblies, and precision equipment. The 1/4-20 UNC Class 3A threads provide superior engagement in coarse-thread applications where rapid assembly and disassembly are required, while the epoxy adhesive chemically bonds to mating surfaces, creating a permanent seal that maintains integrity under extreme thermal cycling (-60° to 300°F). The Rockwell B70 hardness and 70,000 psi tensile strength ensure dimensional stability under heavy loads, making these socket head cap screws ideal for high-stress applications where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision tolerance. Features 1/4-20 UNC coarse threads with right-hand direction and standard socket head profile. The epoxy thread locker begins hardening in 15 minutes and reaches full strength within 24 hours. Compliant with industrial standards for dimensional accuracy and mechanical performance in demanding applications.